将文本设置为自定义对话框类

Question

我想构建一个自定义对话框，我正在动态设置文本。这是我的代码扔NullPointerException。在

rn.setText(homeItem.getHomeItemRedName()+""); 

UPDATAED CODE

listView.setOnItemClickListener(new AdapterView.OnItemClickListener() { 
     @Override 
     public void onItemClick(AdapterView<?> parent, View view, int position, long id) { 
      HomeItem homeItem = (HomeItem) adapter.getItem(position); 
      final Dialog dialog = new Dialog(databaseFightCard.this, android.R.style.Theme_Black_NoTitleBar_Fullscreen); 
      WindowManager.LayoutParams lp = (dialog.getWindow().getAttributes()); 
      lp.dimAmount = 0.5f; 
      dialog.getWindow().addFlags(WindowManager.LayoutParams.FLAG_DIM_BEHIND); 

      Window window = dialog.getWindow(); 
      window.setGravity(Gravity.CENTER); 

      dialog.setContentView(R.layout.custom_dialog); 

      LayoutInflater inflater = (LayoutInflater) databaseFightCard.this.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
      RelativeLayout relative = (RelativeLayout) inflater.inflate(R.layout.custom_dialog, null, false); 

      Button play = (Button) findViewById(R.id.bPlay); 
      Button done = (Button) findViewById(R.id.bDone); 
      TextView rn = (TextView) findViewById(R.id.tvRName); 
      TextView ra = (TextView) findViewById(R.id.tvRAge); 
      TextView rr = (TextView) findViewById(R.id.tvRRecord); 
      TextView rh = (TextView) findViewById(R.id.tvRHeight); 
      TextView rw = (TextView) findViewById(R.id.tvRWeight); 
      TextView rc = (TextView) findViewById(R.id.tvRCity); 
      TextView re = (TextView) findViewById(R.id.tvRExp); 
      TextView bn = (TextView) findViewById(R.id.tvBName); 
      TextView ba = (TextView) findViewById(R.id.tvBAge); 
      TextView br = (TextView) findViewById(R.id.tvBRecord); 
      TextView bh = (TextView) findViewById(R.id.tvBHeight); 
      TextView bw = (TextView) findViewById(R.id.tvBWeight); 
      TextView bc = (TextView) findViewById(R.id.tvBCity); 
      TextView be = (TextView) findViewById(R.id.tvBExp); 


      rn.setText(homeItem.getHomeItemRedName()+""); 
      ra.setText(homeItem.getHomeItemRedAge()+""); 
      rr.setText(homeItem.getHomeItemRedRecord()+""); 
      rh.setText(homeItem.getHomeItemRedHeight()+""); 
      rw.setText(homeItem.getHomeItemRedWeight()+""); 
      rc.setText(homeItem.getHomeItemRedCity()+""); 
      re.setText(homeItem.getHomeItemRedExp()+""); 
      bn.setText(homeItem.getHomeItemBlueName()+""); 
      ba.setText(homeItem.getHomeItemBlueAge()+""); 
      br.setText(homeItem.getHomeItemBlueRecord()+""); 
      bh.setText(homeItem.getHomeItemBlueHeight()+""); 
      bw.setText(homeItem.getHomeItemBlueWeight()+""); 
      bc.setText(homeItem.getHomeItemBlueCity()+""); 
      be.setText(homeItem.getHomeItemBlueExp()+""); 
      dialog.setContentView(relative); 

      play.setOnClickListener(new View.OnClickListener() { 
       @Override 
       public void onClick(View view) { 
        //add the play intent here 
        dialog.dismiss(); 
       } 
      }); 

      done.setOnClickListener(new View.OnClickListener() { 
       @Override 
       public void onClick(View view) { 
        dialog.dismiss(); 
       } 
      }); 
       dialog.show(); 

     } 
    }); 

我得到的NullPointerException请解释我如何可以将文本设置为我的对话。

Answer 1

在尝试查找textViews之前，先尝试显示对话框，如在对话框中放置dialog.show。或者，或者先膨胀你的视图并将视图传递给对话框。你现在正在做的是试图在充气之前找到视图。

编辑：要使用充气机，试试这个，

LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 

    RelativeLayout view = (RelativeLayout)inflater.inflate(R.layout.custom_dialog, null, false); 

    TextView rn = (TextView) view.findViewById(R.id.tvRName); 

    dialog.setContentView(view); 

编辑2：

listView.setOnItemClickListener(new AdapterView.OnItemClickListener() { 
    @Override 
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) { 
     HomeItem homeItem = (HomeItem) adapter.getItem(position); 
     final Dialog dialog = new Dialog(databaseFightCard.this, android.R.style.Theme_Black_NoTitleBar_Fullscreen); 
     WindowManager.LayoutParams lp = (dialog.getWindow().getAttributes()); 
     lp.dimAmount = 0.5f; 
     dialog.getWindow().addFlags(WindowManager.LayoutParams.FLAG_DIM_BEHIND); 

     Window window = dialog.getWindow(); 
     window.setGravity(Gravity.CENTER); 

     LayoutInflater inflater = (LayoutInflater) databaseFightCard.this.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
     RelativeLayout relative = (RelativeLayout) inflater.inflate(R.layout.custom_dialog, null, false); 

     dialog.setContentView(relative); 

     Button play = (Button) relative.findViewById(R.id.bPlay); 
     Button done = (Button) relative.findViewById(R.id.bDone); 
     TextView rn = (TextView) relative.findViewById(R.id.tvRName); 
     TextView ra = (TextView) relative.findViewById(R.id.tvRAge); 
     TextView rr = (TextView) relative.findViewById(R.id.tvRRecord); 
     TextView rh = (TextView) relative.findViewById(R.id.tvRHeight); 
     TextView rw = (TextView) relative.findViewById(R.id.tvRWeight); 
     TextView rc = (TextView) relative.findViewById(R.id.tvRCity); 
     TextView re = (TextView) relative.findViewById(R.id.tvRExp); 
     TextView bn = (TextView) relative.findViewById(R.id.tvBName); 
     TextView ba = (TextView) relative.findViewById(R.id.tvBAge); 
     TextView br = (TextView) relative.findViewById(R.id.tvBRecord); 
     TextView bh = (TextView) relative.findViewById(R.id.tvBHeight); 
     TextView bw = (TextView) relative.findViewById(R.id.tvBWeight); 
     TextView bc = (TextView) relative.findViewById(R.id.tvBCity); 
     TextView be = (TextView) relative.findViewById(R.id.tvBExp); 


     rn.setText(homeItem.getHomeItemRedName()+""); 
     ra.setText(homeItem.getHomeItemRedAge()+""); 
     rr.setText(homeItem.getHomeItemRedRecord()+""); 
     rh.setText(homeItem.getHomeItemRedHeight()+""); 
     rw.setText(homeItem.getHomeItemRedWeight()+""); 
     rc.setText(homeItem.getHomeItemRedCity()+""); 
     re.setText(homeItem.getHomeItemRedExp()+""); 
     bn.setText(homeItem.getHomeItemBlueName()+""); 
     ba.setText(homeItem.getHomeItemBlueAge()+""); 
     br.setText(homeItem.getHomeItemBlueRecord()+""); 
     bh.setText(homeItem.getHomeItemBlueHeight()+""); 
     bw.setText(homeItem.getHomeItemBlueWeight()+""); 
     bc.setText(homeItem.getHomeItemBlueCity()+""); 
     be.setText(homeItem.getHomeItemBlueExp()+""); 
     dialog.setContentView(relative); 

     play.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View view) { 
       //add the play intent here 
       dialog.dismiss(); 
      } 
     }); 

     done.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View view) { 
       dialog.dismiss(); 
      } 
     }); 
      dialog.show(); 

    } 
});