Android 四大组件学习之Activity三

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="53dp"
        android:text="MainActivity" />

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/textView1"
        android:layout_below="@+id/textView1"
        android:layout_marginTop="188dp"
        android:text="Button" />

    <EditText
        android:id="@+id/editText1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/textView1"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="87dp"
        android:ems="10" />

public class MainActivity extends Activity {

	private EditText editText;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        //获得Button控件
        Button button = (Button)findViewById(R.id.button1);
        //获得EditText控件
        editText = (EditText)findViewById(R.id.editText1);
        //给Button控件设置监听器
        button.setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View v) {
				// 当按下时，通过Intent跳转到SecondActivity
				Log.i("Activity_Log", "Button按下");
				//new一个Intent
				Intent intent = new Intent(MainActivity.this, SecondActivity.class);
				//获得Edittext中输入的字符
				String string = editText.getText().toString();
				//将获得字符放入Intent
				intent.putExtra("12345", string);
				//启动Activity
				startActivity(intent);
			}
		});
    }
}

public class SecondActivity extends Activity {

	private TextView textView;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_second);
		Log.i("Activity_Log", "SecondActivity被创建");
		
		textView = (TextView)findViewById(R.id.textView1);
		//获得启动SecondActivity的Intent，也就是MainActivity中new 的intent
		Intent intent = this.getIntent();
		//获得传进来的值
		Bundle bundle = intent.getExtras();
		//通过key值找到所对应的Value
		String string = bundle.getString("12345");
		//设置的TextView
		textView.setText(string);
	}
}