不是顯示一個數組列表

我想顯示在一個TextView一個數組列表的數據的數據，但我有問題..
用戶添加上的EditText，然後列出數據，這些數據必須在TextView上顯示，但它不起作用。
我不知道是否必須放置底座，但我認爲不需要它。

我的xml文件是：

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" 
android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin" 
android:paddingRight="@dimen/activity_horizontal_margin" 
android:paddingTop="@dimen/activity_vertical_margin" 
android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity"> 

<TextView 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:textAppearance="?android:attr/textAppearanceMedium" 
    android:id="@+id/textView" /> 

<ScrollView 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:layout_below="@+id/add" 
    android:layout_toRightOf="@+id/textView" 
    android:layout_toEndOf="@+id/textView"> 

    <LinearLayout 
     android:id="@+id/linearLayout" 
     android:layout_width="match_parent" 
     android:orientation="vertical" 
     android:layout_height="wrap_content"> 

    </LinearLayout> 
</ScrollView> 

<Button 
    android:id="@+id/add" 
    android:layout_width="60dp" 
    android:layout_height="60dp" 
    android:text="" 

    android:background="@android:drawable/ic_menu_add" 
    android:tint="#91d1be" 

    android:layout_below="@+id/textView" 
    android:layout_toRightOf="@+id/textView" 
    android:layout_toEndOf="@+id/textView" /> 

</RelativeLayout>

的Java代碼：

public class MainActivity extends Activity { 

private LinearLayout mainLinearLayout; 
int counter=0, i=0; 

TextView mTextView; 
Button add; 

@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 

    mTextView = (TextView)findViewById(R.id.textView); 

    add = (Button) findViewById(R.id.add); 
    mainLinearLayout = (LinearLayout) findViewById(R.id.linearLayout); 

    add.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 

      LinearLayout linearLayout = new LinearLayout(MainActivity.this); 
      TableLayout.LayoutParams lp = new TableLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT, 1f); 
      linearLayout.setLayoutParams(lp); 
      linearLayout.setOrientation(LinearLayout.HORIZONTAL); 

      EditText ed; 
      List<EditText> allEds = new ArrayList<EditText>(); 

      ed = new EditText(MainActivity.this); 
      allEds.add(ed); 
      ed.setId(counter); 
      ed.setLayoutParams(new TableLayout.LayoutParams(0, ViewGroup.LayoutParams.WRAP_CONTENT, 0.5f)); 
      linearLayout.addView(ed); 
      ed.setInputType(InputType.TYPE_CLASS_NUMBER| InputType.TYPE_NUMBER_FLAG_DECIMAL); 

      mainLinearLayout.addView(linearLayout); 

      Double[] doubles = new Double[allEds.size()]; 
      String[] strings = new String[allEds.size()]; 

      for(i=0;i<allEds.size();i++){ 

       strings[i]= allEds.get(i).getText().toString(); 

       if(strings[i].length()>0){ 
        doubles[i] = Double.parseDouble(strings[i]); 
       } 

       mTextView.setText(String.valueOf(strings[i])); 
      } 
     } 
    }); 
} 
}

是人誰可以幫我嗎？謝謝！！

來源

2017-01-13 ni gi

你是想自己重新實現ListView控件的功能？ – Gudin

你的'ListView'在哪裏？ –

對不起...數組列表我想說！ –

初始化allEds的onClick外（）方法和加入字符串數組的所有值在TextView中顯示它。希望這有助於 -

private LinearLayout mainLinearLayout; 
int counter = 0, i = 0; 

TextView mTextView; 
Button add; 
List<EditText> allEds; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 
    mTextView = (TextView) findViewById(R.id.textView); 

    add = (Button) findViewById(R.id.add); 
    mainLinearLayout = (LinearLayout) findViewById(R.id.linearLayout); 
    allEds = new ArrayList<EditText>(); 

    add.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 

      LinearLayout linearLayout = new LinearLayout(MainActivity.this); 
      TableLayout.LayoutParams lp = new TableLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT, 1f); 
      linearLayout.setLayoutParams(lp); 
      linearLayout.setOrientation(LinearLayout.HORIZONTAL); 

      EditText ed; 

      ed = new EditText(MainActivity.this); 
      allEds.add(ed); 
      ed.setId(counter); 
      ed.setLayoutParams(new TableLayout.LayoutParams(0, ViewGroup.LayoutParams.WRAP_CONTENT, 0.5f)); 
      linearLayout.addView(ed); 
      ed.setInputType(InputType.TYPE_CLASS_NUMBER | InputType.TYPE_NUMBER_FLAG_DECIMAL); 

      mainLinearLayout.addView(linearLayout); 

      Double[] doubles = new Double[allEds.size()]; 
      String[] strings = new String[allEds.size()]; 


      for (i = 0; i < allEds.size(); i++) { 

       strings[i] = allEds.get(i).getText().toString(); 

       if (strings[i].length() > 0) { 
        doubles[i] = Double.parseDouble(strings[i]); 
       } 
      } 

      mTextView.setText(TextUtils.join(" ",strings)); 
     } 
    }); 
}

來源

2017-01-13 11:34:11

哇！它正在工作......非常感謝！唯一的問題是，在應用程序的開始，TextView被稱爲「null」..你有什麼想法？ –

你是說你在應用程序啓動時看到文本「null」？ –

好的，我修好了......謝謝！也許你知道當按下按鈕時如何將光標自動移動到下一行？ –

public class MainActivity extends Activity { 

private LinearLayout mainLinearLayout; 
int counter=0, i=0; 

TextView mTextView; 
Button add; 
List<EditText> allEds; 
@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 

    mTextView = (TextView)findViewById(R.id.textView); 

    add = (Button) findViewById(R.id.add); 
    mainLinearLayout = (LinearLayout) findViewById(R.id.linearLayout); 

    add.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 

      LayoutParams linearLayout = new LayoutParams(
    LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT); 


      EditText ed; 
allEds = new ArrayList<EditText>(); 

      ed = new EditText(MainActivity.this); 
      allEds.add(ed); 
      ed.setId(counter); 
      ed.setLayoutParams(linearLayout); 
ed.setInputType(InputType.TYPE_CLASS_NUMBER| InputType.TYPE_NUMBER_FLAG_DECIMAL); 


      mainLinearLayout.addView(ed); 

      Double[] doubles = new Double[allEds.size()]; 
      String[] strings = new String[allEds.size()]; 

      for(i=0;i<allEds.size();i++){ 

       strings[i]= allEds.get(i).getText().toString(); 

       if(strings[i].length()>0){ 
        doubles[i] = Double.parseDouble(strings[i]); 
       } 

       mTextView.setText(String.valueOf(strings[i])); 
      } 
     } 
    }); 
} 
}

來源

2017-01-13 12:28:52

不是顯示一個數組列表

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