安卓Webview 我的应用程序中的当前代码工作方式如下: 当用户单击后退一次时,它会显示一个按钮,询问“您是否要退出?”并显示是或否选项。如果我们选择Yes,它将退出应用程序并显示插页式广告。如果按No,则保留在该活动中。
我想要的是: 当用户按返回键时,它会返回到上一个活动。如果用户双击返回按钮,那么它将要求退出,如果用户选择Yes。用户将退出应用程序并出现插页式广告。
请帮助我解决这个问题。
主要活动:
public class MainActivity extends Activity{
private Fragment contentFragment;
String testDevice = "D0A04359EA1ECE9BA0CD4B6F457A9991";
String testDevice2 = "63C3530DA03C191310DB9AB8F0672E5C";
String testDevice3 = "801F2141A1DC3F743363AFDFDC42AF3A";
private InterstitialAd mInterstitialAd;
private AdView mAdView;
boolean displayAd = false;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
WebView mainWebView = (WebView) findViewById(R.id.mainWebView);
WebSettings webSettings = mainWebView.getSettings();
webSettings.setJavaScriptEnabled(true);
mainWebView.setWebViewClient(new MyCustomWebViewClient());
mainWebView.setScrollBarStyle(View.SCROLLBARS_INSIDE_OVERLAY);
mainWebView.loadUrl(this.getString(R.string.channel_url));
mAdView = (AdView) findViewById(R.id.ad_view);
// Create an ad request. Check your logcat output for the hashed device ID to
// get test ads on a physical device. e.g.
// "Use AdRequest.Builder.addTestDevice("ABCDEF012345") to get test ads on this device."
AdRequest adRequest = new AdRequest.Builder()
.addTestDevice(testDevice)
.addTestDevice(testDevice2)
.addTestDevice(testDevice3)
.build();
mAdView.setAdListener(new AdListener() {
@Override
public void onAdLoaded() {
displayAd = true;
// View servername = findViewById(R.id.txt_List);
// RelativeLayout.LayoutParams layoutparams =
(RelativeLayout.LayoutParams) servername.getLayoutParams();
// layoutparams.addRule(RelativeLayout.BELOW, mAdView.getId());
// layoutparams.removeRule(RelativeLayout.ALIGN_PARENT_TOP);
// servername.setLayoutParams(layoutparams);
}
@Override
public void onAdFailedToLoad(int errorCode) {
if (!displayAd) {
}
}
@Override
public void onAdClosed() {
// Proceed to the next level.
}
});
// Start loading the ad in the background.
mAdView.loadAd(adRequest);
getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_ADJUST_PAN);
// Create the InterstitialAd and set the adUnitId (defined in values/strings.xml).
mInterstitialAd = newInterstitialAd();
loadInterstitial();
}
private class MyCustomWebViewClient extends WebViewClient {
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
view.loadUrl(url);
return true;
}
}
private InterstitialAd newInterstitialAd() {
InterstitialAd interstitialAd = new InterstitialAd(this);
interstitialAd.setAdUnitId(getString(R.string.interstitial_ad_unit_id));
interstitialAd.setAdListener(new AdListener() {
@Override
public void onAdLoaded() {
}
@Override
public void onAdFailedToLoad(int errorCode) {
}
@Override
public void onAdClosed() {
// Proceed to the next level.
finish();
//goToNextLevel();
}
});
return interstitialAd;
}
private void showInterstitial() {
// Show the ad if it's ready. Otherwise toast and reload the ad.
if (mInterstitialAd != null && mInterstitialAd.isLoaded()) {
mInterstitialAd.show();
} else {
finish();
}
}
@Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
return super.onOptionsItemSelected(item);
}
private void loadInterstitial() {
// Disable the next level button and load the ad.
AdRequest adRequest = new AdRequest.Builder()
.addTestDevice(testDevice)
.addTestDevice(testDevice2)
.addTestDevice(testDevice3)
.setRequestAgent("android_studio:ad_template").build();
mInterstitialAd.loadAd(adRequest);
}
/*
* We call super.onBackPressed(); when the stack entry count is > 0. if it
* is instanceof EmpListFragment or if the stack entry count is == 0, then
* we prompt the user whether to quit the app or not by displaying dialog.
* In other words, from EmpListFragment on back press it quits the app.
*/
@Override
public void onBackPressed() {
onShowQuitDialog();
}
public void onShowQuitDialog() {
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setCancelable(false);
builder.setMessage("Do You Want To Quit?");
builder.setPositiveButton(android.R.string.yes,
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int id) {
showInterstitial();
}
});
builder.setNegativeButton(android.R.string.no,
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
dialog.cancel();
}
});
builder.create().show();
}
}
GestureDetector
,但是一个快速的方法是在用户按下返回按钮时启动一个计时器,如果计时器结束之前有第二次点击,则认为是双击。否则,它就是一个简单的点击,您可以结束您的活动。 - Edson Menegatti