Question

是否可以更新TabWidget图标/指示器？如果是这样，当你通过意图创建TabContent时如何？

以下编辑，感谢@Bart

通用代码：

MainActivity：

public class TestActivity extends TabActivity {

public int i;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    //TabHost mTabHost = (TabHost) findViewById(android.R.id.tabhost);

    TabHost mTabHost = getTabHost();

    mTabHost.addTab(mTabHost.newTabSpec("tab1").setContent(
            new Intent(this, OneActivity.class)).setIndicator("One"));
    mTabHost.addTab(mTabHost.newTabSpec("tab2").setContent(
            new Intent(this, TwoActivity.class)).setIndicator("Two"));

    changeTitle(0, 20);
}

public void changeTitle(int cnt, int i){
    View v = getTabWidget().getChildAt(cnt);
    TextView tv = (TextView) v.findViewById(android.R.id.title);
    tv.setText("One ("+i+")");
}

}

OneActivity（ChildActivity）：

public class OneActivity extends Activity {
TextView tv;
Button btn;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.one);

    tv = (TextView) findViewById(R.id.tv);
    btn = (Button) findViewById(R.id.btn);

    btn.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {

            int i = Integer.parseInt((String) tv.getText());
            i++;
            tv.setText(""+i);

             TestActivity parent = OneActivity.this.getParent();
             parent.changeTitle(0,i);

        }
    });
}

}

我想在标签的标题中显示数字

Answer 1

这是有可能的但是有点棘手：

ViewGroup vg = (ViewGroup) getTabHost().getTabWidget().getChildAt(0);
TextView tv = (TextView) vg.getChildAt(1);

调用getChildAt（）时应注意索引。最好的方法是调试和检查。

由于1.6 TabWidget有一个方法getChildTabViewAt，所以你可以跳过第一行并写下：

ViewGroup vg = (ViewGroup) getTabHost().getTabWidget().getChildTabViewAt(0);

<小时/>
我还附上了Android SDK的源代码，以显示如何构建TabWidget图标：

View tabIndicator = inflater.inflate(R.layout.tab_indicator, 
mTabWidget, // tab widget is the parent
false); // no inflate params

final TextView tv = (TextView) tabIndicator.findViewById(R.id.title);
tv.setText(mLabel);
final ImageView iconView = (ImageView) tabIndicator.findViewById(R.id.icon); 
iconView.setImageDrawable(mIcon);

如您所见，它包含TextView和ImageView。

Answer 2

尝试像这样获取imageView

ImageView v = (ImageView)tabActivity.getTabHost().getTabWidget().getChildTabViewAt(i).findViewById(android.R.id.icon);

v.setImageDrawable(getResources().getDrawable(R.drawable.newIcon));

Answer 3

给出标题和图标的数组

for (int i = 0; i < numTabs; i++ ) {
    TabSpec spec = host.newTabSpec(String.valueOf(i)); //sets tab index
    Drawable icon = res.getDrawable(icons[i]);  //sets the icon
    // set tab text and icon
    spec.setIndicator(titles[i], icon);  //sets the title

    host.addTab(spec);
}

动态更新TabWidget图标？

3 个答案: