AlertDialog编辑框无法调出输入法、锁定Activity方向、自定义进度条的WebView基础使用

来源：互联网发布：雅思7分有多难知乎编辑：程序博客网时间：2024/05/24 01:45

1.安卓系统的AlertDialog中点击EditText无法调出系统输入法软键盘的貌似，如下写即可调出

AlertDialog.Builder mBuilder = new AlertDialog.Builder(MainActivity.this);
LayoutInflater li = LayoutInflater.from(MainActivity.this);
View dialogView = li.inflate(R.layout.dialog_login, null);
final TextView username = (TextView) dialogView.findViewById(R.id.dialoglogin_username);
Button login = (Button) dialogView.findViewById(R.id.dialoglogin_btn_yes);
Button cancel = (Button) dialogView.findViewById(R.id.dialoglogin_btn_no);
final AlertDialog dialog= mBuilder.create();
dialog.setCancelable(false);
dialog.setView(new EditText(MainActivity.this));//只有添加这句话才能让AlertDialog能够调用输入法
dialog.show();
dialog.setContentView(dialogView);，

2.锁定Activity为水平方向，防止屏幕旋转。在AndroidManifest.xml中相应的Activity中配置： android:screenOrientation="portrait"

同时，安卓默认的屏幕旋转会销毁当前Activity再重新onCreate(),所以当前Activity变量都会被重置，为了不重新oncreate()需要在activity配置文件中配置 android:configChanges="keyboardHidden|orientation|screenSize"，这样当屏幕旋转的时候只会触发以下方法

@Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
//判断当前是横屏还是竖屏显示不同的布局
if (this.getResources().getConfiguration().orientation == Configuration.ORIENTATION_PORTRAIT)
{//竖屏
menuGrid.setNumColumns(2);
} else
{
// 横屏
menuGrid.setNumColumns(4);
}

}

3.带自定义进度条的WebView展示html内容

Activity代码如下:

public class WebBrowserActivity extends Activity {
private WebView wv_energy_baidu;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.wv_baidu);
init();
}

private void init(){

String home_url="http://www.baidu.com";
Intent i = getIntent();
if(i.hasExtra("url"))home_url= i.getExtras().getString("url");
final TextView webtitle = (TextView) findViewById(R.id.webbrowser_webtitle);
LinearLayout backLayout = (LinearLayout) findViewById(R.id.webbrowser_backicon);
final ProgressBar pb = (ProgressBar) findViewById(R.id.webbrowser_myProgressBar);
pb.setMax(100);
wv_energy_baidu = (WebView) findViewById(R.id.wv_energy_baidu);
backLayout.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
finish();
}
});

//WebView加载web资源
wv_energy_baidu.loadUrl(home_url);
//覆盖WebView默认使用第三方或系统默认浏览器打开网页的行为，使网页用WebView打开
wv_energy_baidu.setWebViewClient(new WebViewClient(){
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
// TODO Auto-generated method stub
//返回值是true的时候控制去WebView打开，为false调用系统浏览器或第三方浏览器
view.loadUrl(url);
return true;
}
});
wv_energy_baidu.setWebChromeClient(new WebChromeClient(){
@Override
public void onReceivedTitle(WebView view, String title) {
// setTitle(title);
webtitle.setText(title);
}
@Override
public void onProgressChanged(WebView view, int newProgress) {
if(newProgress<100){
if(pb.getVisibility()==View.GONE)
pb.setVisibility(View.VISIBLE);
pb.setProgress(newProgress);
}else{
pb.setProgress(100);
Animation animation=AnimationUtils.loadAnimation(WebBrowserActivity.this, R.anim.webprogress_animation);
// 运行动画 animation
pb.startAnimation(animation);
// 将 spinner 的可见性设置为不可见状态
pb.setVisibility(View.INVISIBLE);
}
super.onProgressChanged(view, newProgress);
}
});
}
private void initData() {
WebSettings settings = wv_energy_baidu.getSettings();
settings.setJavaScriptEnabled(true);

}
public boolean onKeyDown(int keyCode, KeyEvent event) {
// TODO Auto-generated method stub
if(keyCode==KeyEvent.KEYCODE_BACK)
{
if(wv_energy_baidu.canGoBack())
{
wv_energy_baidu.goBack();//返回上一页面
return true;
}
else
{
finish();
// System.exit(0);//退出程序
}
}
return super.onKeyDown(keyCode, event);
}
}

wv.xml文件内容如下:

mystyle_progress.xml文件内容如下:

<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >

<item android:id="@android:id/background">

<shape>

<corners android:radius="5dip" />

<gradient
android:angle="0"
android:centerY="0.75"
android:centerColor="#ffFFFFFF"
android:endColor="#ffFFFFFF"
android:startColor="#ffFFFFFF"
/>

</shape>
</item>

<item android:id="@android:id/secondaryProgress">

<clip>

<shape>

<corners android:radius="5dip" />

<gradient
android:angle="0"
android:centerY="0.75"
android:centerColor="#ffFFFFFF"
android:endColor="#ffFFFFFF"
android:startColor="#ffFFFFFF" />

</shape>
</clip>
</item>

<item android:id="@android:id/progress">

<clip>

<shape>

<corners android:radius="5dip" />

<gradient
android:angle="0"
android:endColor="#ffFFFFFF"
android:startColor="#ff00CD00"
/>

</shape>
</clip>
</item>

</layer-list>

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