Android学习第二天：Toast（提醒）、Menu（菜单）、Intent的显式和隐式（包括打开、适配网站，调用拨号界面等）

Button bt1 = (Button) findViewById(R.id.button_1);
bt1.setOnClickListener(new View.OnClickListener() {
   @Override
   public void onClick(View view) {
        Toast.makeText(MainActivity.this, "您点击了按钮1", Toast.LENGTH_SHORT).show();
    }
});

<menu xmlns:android="http://schemas.android.com/apk/res/android">
    <item
       android:id="@+id/add_item"
       android:title="Add"/>
    <item
       android:id="@+id/remove_item"
       android:title="Remove" />
</menu>

public boolean onCreateOptionsMenu(Menu menu){
   super.onCreateOptionsMenu(menu);
    getMenuInflater().inflate(R.menu.main,menu);
   return true;
}

public boolean onOptionsItemSelected(MenuItem item){
   switch(item.getItemId()){
       case R.id.add_item:
            Toast.makeText(this, "您点击了Add按钮", Toast.LENGTH_SHORT).show();
           break;
       case R.id.remove_item:
            Toast.makeText(this, "您点击了Remove按钮", Toast.LENGTH_SHORT).show();
           break;
       default:
    }
   return true;
}

public class SecondActivity extends AppCompatActivity{
    protected void onCreate(Bundle savedInstanceState){
       super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_second);
    }
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
   android:layout_width="match_parent"
   android:layout_height="match_parent"
   android:orientation="vertical">

    <TextView
       android:layout_width="wrap_content"
       android:layout_height="wrap_content"
       android:text="@string/hello_world"  />

</LinearLayout>

<activity android:name=".SecondActivity">
</activity>

Button bt1 = (Button) findViewById(R.id.button_1);
bt1.setOnClickListener(new View.OnClickListener() {
   @Override
   public void onClick(View view) {
        Intent intent = new Intent(MainActivity.this,SecondActivity.class);
        startActivity(intent);
    }
});

<activity android:name=".SecondActivity">
    <intent-filter>
        <action android:name="bistu.com.test.ACTION_START"/>
        <category android:name="android.intent.category.DEFAULT" />
    </intent-filter>
</activity>

Button bt1 = (Button) findViewById(R.id.button_1);
bt1.setOnClickListener(new View.OnClickListener() {
   @Override
   public void onClick(View view) {
        Intent intent = new Intent("bistu.com.test.ACTION_START");
        startActivity(intent);
    }
});

bt1.setOnClickListener(new View.OnClickListener() {
   @Override
   public void onClick(View view) {
        Intent intent = new Intent(Intent.ACTION_VIEW);
        intent.setData(Uri.parse("http://www.baidu.com"));
        startActivity(intent);
    }
});

<activity android:name=".SecondActivity">
    <intent-filter>
        <action android:name="android.intent.action.VIEW"/>
        <category android:name="android.intent.category.DEFAULT" />
        <data android:scheme="http"/>
    </intent-filter>
</activity>

bt1.setOnClickListener(new View.OnClickListener() {
   @Override
   public void onClick(View view) {
        Intent intent = new Intent(Intent.ACTION_DIAL);
        intent.setData(Uri.parse("tel:10086"));
        startActivity(intent);
    }
});