android開(kāi)發(fā)之歡迎界面的小例子

2020-04-11 12:16:42

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首先你得寫好xml文件，這也是最主要的。

然后，在activity中加入一個(gè)線程，延時(shí)2秒，用來(lái)跳轉(zhuǎn)到主界面。

activity中線程代碼如下：(順便檢測(cè)一下網(wǎng)絡(luò)是否打開(kāi)）

[java]

復(fù)制代碼代碼如下:

@Override
 protected void onStart() {
 super.onStart();
 if(isNetworkConnected()){
 new Thread(){
 @Override
 public void run() {
 try {
 Thread.sleep(2000);
 Intent intent = new Intent(SplashActivity.this,CompusAssistMain.class);
 startActivity(intent);
 finish();
 } catch (InterruptedException e) {
 e.printStackTrace();
 }

 }
 }.start();
 }else{
 //彈出對(duì)話框讓用戶設(shè)置網(wǎng)絡(luò)
 AlertDialog.Builder builder = new Builder(this);
 builder.setTitle("設(shè)置網(wǎng)絡(luò)");
 builder.setMessage("網(wǎng)絡(luò)錯(cuò)誤請(qǐng)?jiān)O(shè)置網(wǎng)絡(luò)");
 builder.setPositiveButton("設(shè)置網(wǎng)絡(luò)", new OnClickListener() {
 public void onClick(DialogInterface dialog, int which) {
 Intent intent = new Intent();
 intent.setClassName("com.android.settings", "com.android.settings.WirelessSettings");
 startActivity(intent);
 }
 });
 builder.setNegativeButton("取消", new OnClickListener() {

 public void onClick(DialogInterface dialog, int which) {
 finish();
 }
 });
 builder.create().show();
 }
 }

@Override
protected void onStart() {
super.onStart();
if(isNetworkConnected()){
   new Thread(){
    @Override
    public void run() {
     try {
      Thread.sleep(2000);
      Intent intent = new Intent(SplashActivity.this,CompusAssistMain.class);
      startActivity(intent);
      finish();
     } catch (InterruptedException e) {
      e.printStackTrace();
     }

    }
   }.start();
}else{
   //彈出對(duì)話框讓用戶設(shè)置網(wǎng)絡(luò)
   AlertDialog.Builder builder = new Builder(this);
   builder.setTitle("設(shè)置網(wǎng)絡(luò)");
   builder.setMessage("網(wǎng)絡(luò)錯(cuò)誤請(qǐng)?jiān)O(shè)置網(wǎng)絡(luò)");
   builder.setPositiveButton("設(shè)置網(wǎng)絡(luò)", new OnClickListener() {
    public void onClick(DialogInterface dialog, int which) {
     Intent intent = new Intent();
     intent.setClassName("com.android.settings", "com.android.settings.WirelessSettings");
     startActivity(intent);
    }
   });
   builder.setNegativeButton("取消", new OnClickListener() {

    public void onClick(DialogInterface dialog, int which) {
     finish();
    }
   });
   builder.create().show();
}
}檢測(cè)網(wǎng)絡(luò)的類isNetWorkConnected():

[java]

復(fù)制代碼代碼如下:

/**
 * 判斷系統(tǒng)的網(wǎng)絡(luò)是否可用
 * @return
 */
 private boolean isNetworkConnected(){
 ConnectivityManager cm = (ConnectivityManager) getSystemService(CONNECTIVITY_SERVICE);
 NetworkInfo info =cm.getActiveNetworkInfo();
 if(info!=null&&info.isConnected()){
 return true;
 }else {
 return false ;
 }

/**
* 判斷系統(tǒng)的網(wǎng)絡(luò)是否可用
* @return
*/
private boolean isNetworkConnected(){
ConnectivityManager cm = (ConnectivityManager) getSystemService(CONNECTIVITY_SERVICE);
NetworkInfo info =cm.getActiveNetworkInfo();
if(info!=null&&info.isConnected()){
return true;
}else {
return false ;
}

這樣就完成了一個(gè)歡迎界面，給自已的應(yīng)用加點(diǎn)色彩。當(dāng)然還要添加配置在Manifest文件中
[html]

復(fù)制代碼代碼如下: