Android中的对话框的使用技巧-白红宇

Android中的对话框的使用技巧

阅读量：5905 次

发布时间：2019-06-19

本文共 20350 字，大约阅读时间需要 67 分钟。

今天我用自己写的一个Demo 和大家详细介绍一个Android中的对话框的使用技巧。

1.确定取消对话框

对话框中有2个按钮通过调用 setPositiveButton 方法和 setNegativeButton 方法可以设置按钮的显示内容以及按钮的监听事件。

我们使用AlerDialog 创建对话框

AlertDialog.Builder builder = new AlertDialog.Builder(MainDialog.this);

使用builder设置对话框的title button icon 等等

builder.setIcon(R.drawable.icon);         builder.setTitle("你确定要离开吗？");         builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {             public void onClick(DialogInterface dialog, int whichButton) {                 //这里添加点击确定后的逻辑                showDialog("你选择了确定");             }         });         builder.setNegativeButton("取消", new DialogInterface.OnClickListener() {             public void onClick(DialogInterface dialog, int whichButton) {                 //这里添加点击确定后的逻辑                showDialog("你选择了取消");             }         });         builder.create().show();

这个dialog用于现实onClick后监听的内容信息

private void showDialog(String str) {  new AlertDialog.Builder(MainDialog.this)       .setMessage(str)       .show();  }

2.多个按钮信息框

AlertDialog.Builder builder = new AlertDialog.Builder(MainDialog.this);           builder.setIcon(R.drawable.icon);  builder.setTitle("投票");  builder.setMessage("您认为什么样的内容能吸引您？");  builder.setPositiveButton("有趣味的", new DialogInterface.OnClickListener() {      public void onClick(DialogInterface dialog, int whichButton) {          showDialog("你选择了有趣味的");      }  });  builder.setNeutralButton("有思想的", new DialogInterface.OnClickListener() {      public void onClick(DialogInterface dialog, int whichButton) {          showDialog("你选择了有思想的");                          }  });  builder.setNegativeButton("主题强的", new DialogInterface.OnClickListener() {      public void onClick(DialogInterface dialog, int whichButton) {          showDialog("你选择了主题强的");        }  });  builder.create().show();

3.列表框

这个数组用于列表选择

final String[] mItems = {"item0","item1","itme2","item3","itme4","item5","item6"};  AlertDialog.Builder builder = new AlertDialog.Builder(MainDialog.this);           builder.setTitle("列表选择框");          builder.setItems(mItems, new DialogInterface.OnClickListener() {              public void onClick(DialogInterface dialog, int which) {                  //点击后弹出窗口选择了第几项                 showDialog("你选择的id为" + which + " , " + mItems[which]);              }          });          builder.create().show();

4.单项选择列表框

mSingleChoice 用于记录单选中的ID

int mSingleChoiceID = -1;  AlertDialog.Builder builder = new AlertDialog.Builder(MainDialog.this);   mSingleChoiceID = -1;  builder.setIcon(R.drawable.icon);      builder.setTitle("单项选择");      builder.setSingleChoiceItems(mItems, 0, new DialogInterface.OnClickListener() {          public void onClick(DialogInterface dialog, int whichButton) {                  mSingleChoiceID = whichButton;                  showDialog("你选择的id为" + whichButton + " , " + mItems[whichButton]);          }      });      builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {          public void onClick(DialogInterface dialog, int whichButton) {              if(mSingleChoiceID > 0) {              showDialog("你选择的是" + mSingleChoiceID);              }          }      });      builder.setNegativeButton("取消", new DialogInterface.OnClickListener() {          public void onClick(DialogInterface dialog, int whichButton) {          }      });     builder.create().show();

5.进度条框

点击进度条框按钮后开启一个线程计算读取的进度假设读取结束为 100
Progress在小于100的时候一直在线程中做循环++ 只到读取结束后，停止线程。

mProgressDialog = new ProgressDialog(MainDialog.this);       mProgressDialog.setIcon(R.drawable.icon);       mProgressDialog.setTitle("进度条窗口");       mProgressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);       mProgressDialog.setMax(MAX_PROGRESS);       mProgressDialog.setButton("确定", new DialogInterface.OnClickListener() {           public void onClick(DialogInterface dialog, int whichButton) {               //这里添加点击后的逻辑          }       });       mProgressDialog.setButton2("取消", new DialogInterface.OnClickListener() {           public void onClick(DialogInterface dialog, int whichButton) {               //这里添加点击后的逻辑          }       });       mProgressDialog.show();       new Thread(this).start();  public void run() {  int Progress = 0;  while(Progress < MAX_PROGRESS) {  try {      Thread.sleep(100);      Progress++;        mProgressDialog.incrementProgressBy(1);  } catch (InterruptedException e) {      // TODO Auto-generated catch block     e.printStackTrace();  }  }

6.多项选择列表框

MultiChoiceID 用于记录多选选中的id号存在ArrayList中
选中后 add 进ArrayList
取消选中后 remove 出ArrayList。

ArrayList 
    
     MultiChoiceID = new ArrayList 
     
      ();  AlertDialog.Builder builder = new AlertDialog.Builder(MainDialog.this);   MultiChoiceID.clear();  builder.setIcon(R.drawable.icon);      builder.setTitle("多项选择");      builder.setMultiChoiceItems(mItems,              new boolean[]{false, false, false, false, false, false, false},              new DialogInterface.OnMultiChoiceClickListener() {                  public void onClick(DialogInterface dialog, int whichButton,                          boolean isChecked) {                     if(isChecked) {                         MultiChoiceID.add(whichButton);                         showDialog("你选择的id为" + whichButton + " , " + mItems[whichButton]);                     }else {                         MultiChoiceID.remove(whichButton);                     }                  }              });      builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {          public void onClick(DialogInterface dialog, int whichButton) {              String str = "";              int size = MultiChoiceID.size();              for (int i = 0 ;i < size; i++) {              str+= mItems[MultiChoiceID.get(i)] + ", ";              }              showDialog("你选择的是" + str);          }      });      builder.setNegativeButton("取消", new DialogInterface.OnClickListener() {          public void onClick(DialogInterface dialog, int whichButton) {          }      });     builder.create().show();

7.自定义布局

讲到自定义布局我就得多说一说了，为什么要多说一说呢？
其实自定义布局在Android的开发中非常重要因为它能让开发者做出自己五彩缤纷的Activity 而不用去使用系统枯燥的界面。

自定义dialog有什么好处？

比如我们在开发过长当中要通过介绍系统发送的一个广播弹出一个dialog . 但是dialog必需是基于activity才能呈现出来如果没有activity 的话程序就会崩溃。所以我们可以写一个自定义的 dialog 把它定义成一个activity

这样我们收到一条打开dialog的广播后直接启动这个 activity 程序正常运行~~

这就是自定义dialog的好处。

注明：下面这个例子只是写了自定义dialog 没有把它单独的写在一个activity中如果须要的话可以自己改一下。

AlertDialog.Builder builder = new AlertDialog.Builder(MainDialog.this);    LayoutInflater factory = LayoutInflater.from(this);   final View textEntryView = factory.inflate(R.layout.test, null);       builder.setIcon(R.drawable.icon);       builder.setTitle("自定义输入框");       builder.setView(textEntryView);       builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {           public void onClick(DialogInterface dialog, int whichButton) {           EditText userName = (EditText) textEntryView.findViewById(R.id.etUserName);           EditText password = (EditText) textEntryView.findViewById(R.id.etPassWord);           showDialog("姓名 ："  + userName.getText().toString()  + "密码：" + password.getText().toString() );           }       });       builder.setNegativeButton("取消", new DialogInterface.OnClickListener() {           public void onClick(DialogInterface dialog, int whichButton) {           }       });     builder.create().show();

8.读取进度框

显示一个正在转圈的进度条loading

mProgressDialog = new ProgressDialog(this);   mProgressDialog.setTitle("读取ing");   mProgressDialog.setMessage("正在读取中请稍候");   mProgressDialog.setIndeterminate(true);   mProgressDialog.setCancelable(true);   mProgressDialog.show();

最后如果你还是觉得我写的不够详细不要紧我把源代码的下载地址贴出来欢迎大家一起讨论学习雨松MOMO希望可以和大家一起进步。

下载地址：

自定义View界面大合集

雨松MOMO带大家盘点Android 中的自定义View界面的绘制

今天我用自己写的一个Demo 和大家详细介绍一个Android中自定义View中的使用与绘制技巧。

1.自定义view绘制字符串

相信在实际开发过程中必然很多地方都须要用到系统字为什么会用到系统字？方便省内存我相信做过J2ME游戏开发的朋友应该深知内存有多么多么重要而且使用它还可以带来一个更重要的好处就是很方便的可以实现多国语言的切换笔者现在在正在做的一个产品就是可以多语言切换的软件有英语繁体中文等等设想如果使用图片字的话那每个语言都须要出一套图，我用一个例子简单介绍一下绘制字符串。

1 package cn.m15.xys; 2 3 4 5 import android.app.Activity; 6 7 import android.content.Context; 8 9 import android.graphics.Canvas; 10 11 import android.graphics.Color; 12 13 import android.graphics.Paint; 14 15 import android.graphics.Paint.FontMetrics; 16 17 import android.os.Bundle; 18 19 import android.view.Display; 20 21 import android.view.View; 22 23 24 25 public class Font extends Activity { 26 27     public int mScreenWidth = 0; 28 29     public int mScreenHeight = 0; 30 31     @Override 32 33     protected void onCreate(Bundle savedInstanceState) { 34 35     setContentView(new FontView(this)); 36 37     // 获取屏幕宽高 38 39     Display display = getWindowManager().getDefaultDisplay(); 40 41     mScreenWidth  = display.getWidth(); 42 43     mScreenHeight = display.getHeight(); 44 45     super.onCreate(savedInstanceState); 46 47 48 49     } 50 51 52 53     class FontView extends View { 54 55         public final static String STR_WIDTH = "获取字符串宽为："; 56 57         public final static String STR_HEIGHT = "获取字体高度为："; 58 59         Paint mPaint = null; 60 61 62 63     public FontView(Context context) { 64 65         super(context); 66 67         mPaint = new Paint(); 68 69     } 70 71 72 73     @Override 74 75     protected void onDraw(Canvas canvas) { 76 77         //设置字符串颜色 78 79         mPaint.setColor(Color.WHITE); 80 81         canvas.drawText("当前屏幕宽" + mScreenWidth, 0, 30, mPaint); 82 83         canvas.drawText("当前屏幕高"+ mScreenHeight, 0, 60, mPaint); 84 85         //设置字体大小 86 87         mPaint.setColor(Color.RED); 88 89         mPaint.setTextSize(18); 90 91         canvas.drawText("字体大小为18", 0, 90, mPaint); 92 93         //消除字体锯齿 94 95         mPaint.setFlags(Paint.ANTI_ALIAS_FLAG); 96 97         canvas.drawText("消除字体锯齿后", 0, 120, mPaint); 98 99         //获取字符串宽度100101         canvas.drawText(STR_WIDTH + getStringWidth(STR_WIDTH), 0, 150, mPaint);102103         //获取字体高度104105         canvas.drawText(STR_HEIGHT + getFontHeight(), 0, 180, mPaint);106107         //从string.xml读取字符串绘制108109         mPaint.setColor(Color.YELLOW);110111         canvas.drawText(getResources().getString(R.string.string_font), 0, 210, mPaint);112113         super.onDraw(canvas);114115     }116117118119     /**120121  * 获取字符串宽122123  * @param str124125  * @return126127 */128129     private int getStringWidth(String str) {130131         return (int) mPaint.measureText(STR_WIDTH);132133     }134135     /*136137  * 获取字体高度138139 */140141     private int getFontHeight() {142143         FontMetrics fm = mPaint.getFontMetrics();144145         return (int)Math.ceil(fm.descent - fm.top) + 2;146147     }148149     }150151 }

2.绘制无规则几何图形

绘制无规则几何图形似乎在实际工作中很少可以用到原因是用程序去绘制图形即使在精准再好看也不会有美术出的图片好看但是使用程序绘制图形作为学习来说却是基础中的基础，所以建议大家都看一看。

1 package cn.m15.xys; 2 3 4 5 import android.app.Activity; 6 7 import android.content.Context; 8 9 import android.graphics.Canvas; 10 11 import android.graphics.Color; 12 13 import android.graphics.Paint; 14 15 import android.graphics.Path; 16 17 import android.graphics.RectF; 18 19 import android.os.Bundle; 20 21 import android.view.View; 22 23 24 25 public class Geometry extends Activity { 26 27     public int mScreenWidth = 0; 28 29     public int mScreenHeight = 0; 30 31 32 33     @Override 34 35     protected void onCreate(Bundle savedInstanceState) { 36 37     setContentView(new GeometryView(this)); 38 39     super.onCreate(savedInstanceState); 40 41 42 43     } 44 45 46 47     class GeometryView extends View { 48 49     Paint mPaint = null; 50 51 52 53     public GeometryView(Context context) { 54 55         super(context); 56 57         mPaint = new Paint(); 58 59         mPaint.setFlags(Paint.ANTI_ALIAS_FLAG); 60 61     } 62 63 64 65     @Override 66 67     protected void onDraw(Canvas canvas) { 68 69         super.onDraw(canvas); 70 71 72 73         //设置画布颜色 也就是背景颜色 74 75         canvas.drawColor(Color.WHITE); 76 77 78 79         mPaint.setColor(Color.BLACK); 80 81         canvas.drawText("绘制无规则几何图形喔！！！", 150, 30, mPaint); 82 83 84 85         //绘制一条线 86 87         mPaint.setColor(Color.BLACK); 88 89         mPaint.setStrokeWidth(4); 90 91         canvas.drawLine(0, 0, 100, 100, mPaint); 92 93 94 95         //绘制一个矩形 96 97         mPaint.setColor(Color.YELLOW); 98 99         canvas.drawRect(0, 120, 100, 200, mPaint);100101102103         //绘制一个圆形104105         mPaint.setColor(Color.BLUE);106107         canvas.drawCircle(80, 300, 50, mPaint);108109110111         //绘制一个椭圆112113         mPaint.setColor(Color.CYAN);114115         canvas.drawOval(new RectF(300,370,120,100), mPaint);116117118119         //绘制多边形120121         mPaint.setColor(Color.BLACK);122123         Path path = new Path();124125         path.moveTo(150+5 , 400 -50);126127         path.lineTo(150+45, 400 - 50);128129         path.lineTo(150+30, 460 - 50);130131         path.lineTo(150+20, 460 - 50);132133         path.close();134135         canvas.drawPath(path, mPaint);136137138139     }140141     }142143 }

3.图片的绘制以及旋转缩放的实现

在这点上Android 确实比J2ME 强大很多手机游戏开发最痛苦的是什么？？是游戏引擎的开发，但是工程师会把大部分时间浪费在对坐标上，如果写引擎的时候没有把自适应考虑周全后期会非常痛苦，现在手机屏幕分辨率是各式各样内存大小也是各式各样所以可见自适应屏幕算法有多么的重要。

1 package cn.m15.xys; 2 3 4 5 import android.app.Activity; 6 7 import android.content.Context; 8 9 import android.graphics.Bitmap; 10 11 import android.graphics.BitmapFactory; 12 13 import android.graphics.Canvas; 14 15 import android.graphics.Matrix; 16 17 import android.graphics.Paint; 18 19 import android.os.Bundle; 20 21 import android.view.View; 22 23 import android.view.View.OnClickListener; 24 25 import android.widget.Button; 26 27 import android.widget.LinearLayout; 28 29 30 31 public class Image extends Activity { 32 33     ImageView imageView = null; 34 35 36 37     @Override 38 39     protected void onCreate(Bundle savedInstanceState) { 40 41     imageView = new ImageView(this); 42 43     setContentView(R.layout.image); 44 45     LinearLayout ll = (LinearLayout) findViewById(R.id.iamgeid); 46 47     ll.addView(imageView); 48 49     // 向左移动 50 51     Button botton0 = (Button) findViewById(R.id.buttonLeft); 52 53     botton0.setOnClickListener(new OnClickListener() { 54 55         @Override 56 57         public void onClick(View arg0) { 58 59         imageView.setPosLeft(); 60 61         } 62 63     }); 64 65 66 67     // 向右移动 68 69     Button botton1 = (Button) findViewById(R.id.buttonRight); 70 71     botton1.setOnClickListener(new OnClickListener() { 72 73         @Override 74 75         public void onClick(View arg0) { 76 77         imageView.setPosRight(); 78 79         } 80 81     }); 82 83     // 左旋转 84 85     Button botton2 = (Button) findViewById(R.id.buttonRotationLeft); 86 87     botton2.setOnClickListener(new OnClickListener() { 88 89         @Override 90 91         public void onClick(View arg0) { 92 93         imageView.setRotationLeft(); 94 95         } 96 97     }); 98 99100101     // 右旋转102103     Button botton3 = (Button) findViewById(R.id.buttonRotationRight);104105     botton3.setOnClickListener(new OnClickListener() {106107         @Override108109         public void onClick(View arg0) {110111         imageView.setRotationRight();112113         }114115     });116117118119     // 缩小120121     Button botton4 = (Button) findViewById(R.id.buttonNarrow);122123     botton4.setOnClickListener(new OnClickListener() {124125126127         @Override128129         public void onClick(View arg0) {130131         imageView.setNarrow();132133         }134135     });136137138139     // 放大140141     Button botton5 = (Button) findViewById(R.id.buttonEnlarge);142143     botton5.setOnClickListener(new OnClickListener() {144145146147         @Override148149         public void onClick(View arg0) {150151         imageView.setEnlarge();152153         }154155     });156157158159     super.onCreate(savedInstanceState);160161162163     }164165166167     class ImageView extends View {168169     Paint mPaint = null;170171     Bitmap bitMap = null;172173     Bitmap bitMapDisplay = null;174175     int m_posX = 120;176177     int m_posY = 50;178179     int m_bitMapWidth = 0;180181     int m_bitMapHeight = 0;182183     Matrix mMatrix = null;184185     float mAngle = 0.0f;186187     float mScale = 1f;//1为原图的大小188189190191     public ImageView(Context context) {192193         super(context);194195         mPaint = new Paint();196197         mPaint.setFlags(Paint.ANTI_ALIAS_FLAG);198199         bitMap = BitmapFactory.decodeResource(this.getResources(),200201             R.drawable.image);202203         bitMapDisplay = bitMap;204205         mMatrix = new Matrix();206207         // 获取图片宽高208209         m_bitMapWidth = bitMap.getWidth();210211         m_bitMapHeight = bitMap.getHeight();212213     }214215216217     // 向左移动218219     public void setPosLeft() {220221         m_posX -= 10;222223     }224225226227     // 向右移动228229     public void setPosRight() {230231         m_posX += 10;232233     }234235236237     // 向左旋转238239     public void setRotationLeft() {240241         mAngle--;242243         setAngle();244245     }246247248249     // 向右旋转250251     public void setRotationRight() {252253         mAngle++;254255         setAngle();256257     }258259260261     // 缩小图片262263     public void setNarrow() {264265         if (mScale > 0.5) {266267         mScale -= 0.1;268269         setScale();270271         }272273     }274275276277     // 放大图片278279     public void setEnlarge() {280281         if (mScale < 2) {282283         mScale += 0.1;284285         setScale();286287         }288289     }290291292293     // 设置缩放比例294295     public void setAngle() {296297         mMatrix.reset();298299         mMatrix.setRotate(mAngle);300301         bitMapDisplay = Bitmap.createBitmap(bitMap, 0, 0, m_bitMapWidth,302303             m_bitMapHeight, mMatrix, true);304305     }306307308309     // 设置旋转比例310311     public void setScale() {312313         mMatrix.reset();314315         //float sx X轴缩放316317 //float sy Y轴缩放318319         mMatrix.postScale(mScale, mScale);320321         bitMapDisplay = Bitmap.createBitmap(bitMap, 0, 0, m_bitMapWidth,322323             m_bitMapHeight, mMatrix, true);324325     }326327328329     @Override330331     protected void onDraw(Canvas canvas) {332333         super.onDraw(canvas);334335         canvas.drawBitmap(bitMapDisplay, m_posX, m_posY, mPaint);336337         invalidate();338339     }340341     }342343 }

4.播放frame动画

做游戏的话播放动画可就是必不可少的元素帧动画帧动画顾名思义是一帧一帧的播放。实际在开发中为了节省内存美术会把人物的图片切成一小块一小块然后由程序根据编辑器生成的点把图片在拼接起来这样就可以做到用更少的图片去实现更多的动画效果因为不太方便介绍图片编辑器这个demo我只给大家简单的介绍一下播放动画的原理后期我会深入讲解。

如图所示这个小人一直在行走实际上是4张图片在来回切换每张图片延迟500毫秒后播下一张以此类推。

package cn.m15.xys;  import android.app.Activity;  import android.content.Context;  import android.graphics.Bitmap;  import android.graphics.BitmapFactory;  import android.graphics.Canvas;  import android.graphics.Color;  import android.graphics.Paint;  import android.os.Bundle;  import android.view.View;  public class FramAnimation extends Activity {      public final static int ANIM_COUNT = 4;      @Override      protected void onCreate(Bundle savedInstanceState) {      setContentView(new FramView(this));      super.onCreate(savedInstanceState);      }      class FramView extends View {      Bitmap[] bitmap = new Bitmap[ANIM_COUNT];      Bitmap display = null;      Paint paint = null;      long startTime = 0;      int playID = 0;      public FramView(Context context) {          super(context);          for (int i = 0; i < ANIM_COUNT; i++) {          bitmap[i] = BitmapFactory.decodeResource(this.getResources(),              R.drawable.hero_a + i);          }          display = bitmap[0];          paint = new Paint();          startTime = System.currentTimeMillis();      }      @Override      protected void onDraw(Canvas canvas) {          super.onDraw(canvas);          paint.setColor(Color.WHITE);          canvas.drawText("播放动画中...", 100, 30, paint);          long nowTime = System.currentTimeMillis();          if (nowTime - startTime >= 500) {          startTime=nowTime;          playID++;          if (playID >= ANIM_COUNT) {              playID = 0;          }          canvas.drawBitmap(bitmap[playID], 100, 100, paint);          }          invalidate();      }      }

转载于:https://my.oschina.net/zhenguoguan/blog/138716

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