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常州手机App开发-Android使用间跳转
/**
*
* @ClassName: MainActivity
* @Description: 从一个使用跳转到另一个使用
* @author huantian
* @email huantian@sina.com
* @date 2019-3-9 下午15:38:12
*
*/
public class MainActivity extends Activity {
private Intent intent = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//知道要跳转使用的包名、类名
// ComponentName comp = new ComponentName("com.huan.tian", "com.huan.tian.MainActivity");
// final Intent intent = new Intent();
// intent.setComponent(comp);
// intent.setAction("android.intent.action.VIEW");
//不知道类名
PackageManager pm = getPackageManager();
PackageInfo pi = null;
try {
pi = pm.getPackageInfo("com.huan.tian", 0);
} catch (NameNotFoundException e) {
e.printStackTrace();
}
Intent resolveIntent = new Intent(Intent.ACTION_MAIN, null);
resolveIntent.addCategory(Intent.CATEGORY_LAUNCHER);
resolveIntent.setPackage(pi.packageName);
//找到匹配intent的一切Activity，这个办法能够在intent跳转前调用用来检测是否有契合条件的activity
List<ResolveInfo> apps = pm.queryIntentActivities(resolveIntent, 0);
ResolveInfo ri = apps.iterator().next();
if (ri != null ) {
String className = ri.activityInfo.name;
intent = new Intent(Intent.ACTION_MAIN);
intent.addCategory(Intent.CATEGORY_LAUNCHER);
ComponentName cn = new ComponentName("com.huan.tian", className);
intent.setComponent(cn);
}
Button button = (Button) findViewById(R.id.btn_jump);
button.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
startActivity(intent);
}
});
}
}
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