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Android ApiDemos示例解析(179):Views->Lists->12. Transcript

本例使用一个ListView 和一个TextView 实现了一个类似便笺簿功能,在TextView中输入,然后在ListView中显示,使用ArrayAdapter, 字符串存储使用ArrayList.


[java] 
private ArrayAdapter<String> mAdapter; 
 
private ArrayList<String> mStrings = new ArrayList<String>(); 
 
... 
mAdapter = new ArrayAdapter<String>(this, 
 android.R.layout.易做图_list_item_1, mStrings); 
setListAdapter(mAdapter); 

private ArrayAdapter<String> mAdapter;

private ArrayList<String> mStrings = new ArrayList<String>();

...
mAdapter = new ArrayAdapter<String>(this,
 android.R.layout.易做图_list_item_1, mStrings);
setListAdapter(mAdapter);

为EditText 添加Click 和Key 事件处理,在点击或是按“中键”时将输入文字中ListView中添加一行:

 

[java] 
public void onClick(View v) { 
 sendText(); 
 } 
 
private void sendText() { 
 String text = mUserText.getText().toString(); 
 mAdapter.add(text); 
 mUserText.setText(null); 

 
public boolean onKey(View v, int keyCode, KeyEvent event) { 
 if (event.getAction() == KeyEvent.ACTION_DOWN) { 
 switch (keyCode) { 
 case KeyEvent.KEYCODE_DPAD_CENTER: 
 case KeyEvent.KEYCODE_ENTER: 
 sendText(); 
 return true; 
 } 
 } 
 return false; 

public void onClick(View v) {
 sendText();
 }

private void sendText() {
 String text = mUserText.getText().toString();
 mAdapter.add(text);
 mUserText.setText(null);
}

public boolean onKey(View v, int keyCode, KeyEvent event) {
 if (event.getAction() == KeyEvent.ACTION_DOWN) {
 switch (keyCode) {
 case KeyEvent.KEYCODE_DPAD_CENTER:
 case KeyEvent.KEYCODE_ENTER:
 sendText();
 return true;
 }
 }
 return false;
}

 \

 

 

补充:移动开发 , Android ,
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