我相信下面的代碼會做你想要什麼，但我看不到的方式只能在xml佈局中執行此操作。 基本上我添加了一個textChangedListener到具有兩個不同的佈局選項，我相信你正在尋找兩個不同的TextViews，裏面都帶有日期顯示的TextView自己的相對佈局。當字幕被設置時，其中的第一個用於保存文本，如果它需要多於一行的話，則使用第二個TextView，並且在另一種情況下，另一個將其可見性選項設置爲GONE。 在我的例子中，我使用了一個單獨的線程來改變字幕，希望這不會讓事情混淆太多。
佈局XML如下：
<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:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".MainActivity" >
<TextView
android:id="@+id/title"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:ellipsize="end"
android:textAppearance="?android:attr/textAppearanceSearchResultTitle"
android:background="#FF009999"
android:textIsSelectable="false"
android:text="@string/my_title" />
<RelativeLayout
android:id="@+id/resizingTextContainer"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/title" >
<TextView
android:id="@+id/date"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:textAppearance="?android:attr/textAppearanceSearchResultSubtitle"
android:textIsSelectable="false"
android:textColor="#FFFFFFFF"
android:background="#FF000000" />
<TextView
android:id="@+id/subtitle1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_toLeftOf="@+id/date"
android:textAppearance="?android:attr/textAppearanceSearchResultSubtitle"
android:textIsSelectable="false"
android:textColor="#FFFFFF"
android:background="#FF00FF00" />
<TextView
android:id="@+id/subtitle2"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/date"
android:textAppearance="?android:attr/textAppearanceSearchResultSubtitle"
android:textIsSelectable="false"
android:visibility="gone"
android:textColor="#FFFFFF"
android:background="#FF00FF00" />
</RelativeLayout>
<Button
android:id="@+id/startTestBtn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/resizingTextContainer"
android:layout_centerHorizontal="true"
android:text="Click To Begin"
/>
</RelativeLayout>
和主要活動代碼與TextView的切換邏輯：
package com.example.code.examples.changelayoutwithtextlength;
import android.os.Bundle;
import android.app.Activity;
import android.text.Editable;
import android.text.TextWatcher;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
public class MainActivity extends Activity {
TextWatcher textChangeDisplayCheck = new TextWatcher(){
@Override
public void afterTextChanged(Editable s) {
// TODO Auto-generated method stub
}
@Override
public void beforeTextChanged(CharSequence s, int start, int count,
int after) {
// TODO Auto-generated method stub
}
@Override
public void onTextChanged(CharSequence s, int start, int before,
int count) {
displayLatestSubtitle(s);
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
TextView DateTextView = (TextView)findViewById(R.id.date);
DateTextView.setText("29th April 2013");
Button b = (Button)findViewById(R.id.startTestBtn);
b.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v)
{
v.setEnabled(false);
Thread thread = new testSubtitleThread();
thread.start();
}
});
TextView tv = (TextView)findViewById(R.id.subtitle1);
tv.addTextChangedListener(textChangeDisplayCheck);
TextView tv2 = (TextView)findViewById(R.id.subtitle2);
tv2.addTextChangedListener(textChangeDisplayCheck);
}
private void displayLatestSubtitle(CharSequence newSubtitle)
{
TextView tv = (TextView)findViewById(R.id.subtitle1);
TextView tv2 = (TextView)findViewById(R.id.subtitle2);
tv.removeTextChangedListener(textChangeDisplayCheck);
tv2.removeTextChangedListener(textChangeDisplayCheck);
tv.setVisibility(View.GONE);
tv2.setVisibility(View.GONE);
tv2.setText("");
tv.setText(newSubtitle);
if(tv.getLineCount() > 1)
{
tv.setText("");
tv2.setText(newSubtitle);
tv2.setVisibility(View.VISIBLE);
}
else
{
tv.setVisibility(View.VISIBLE);
}
tv.addTextChangedListener(textChangeDisplayCheck);
tv2.addTextChangedListener(textChangeDisplayCheck);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
public class testSubtitleThread extends Thread
{
String[] subtitles = new String[] { "a short one", "a really long winded subtitle that will take over more than the allowed space", "tiny",
"Really, really, really, really, really, really, really, really, really, really, really, really, really, really, really, really, really, long.",
".....", "text just to long to fit on my device"};
private android.os.Handler handler = new android.os.Handler()
{
@Override
public void handleMessage(android.os.Message msg)
{
if(msg.what < subtitles.length)
{
TextView tv = (TextView)findViewById(R.id.subtitle1);
tv.setText(subtitles[msg.what]);
}
else
{
Button b = (Button)findViewById(R.id.startTestBtn);
b.setEnabled(true);
}
}
};
@Override
public void run()
{
for(int i = 0; i <= subtitles.length; i++)
{
handler.sendEmptyMessage(i);
try
{
Thread.sleep(3000);
}
catch (InterruptedException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
}
我希望這有助於。
好像是有一個解決方案，所以我會接受。可悲的是這似乎是有點faff的只是爲了讓我去的效果，所以我代替設置'機器人：MAXLINES =「1」'上的日期和TextView的設置字幕是'機器人：layout_toLeftOf = 「@ + id/date」'並刪除日期的'android：layout_toRightOf =「@ + id/subtitle」'。這意味着日期始終位於右側的一行上，並且填充可以使字幕適合左側的位置（可能會消耗多行）。無論如何，謝謝你對我的問題的解決方案:) – 2013-04-30 10:38:18