Android-activity-intent

package com.hanqi.myapplication;

import android.content.ComponentName;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.widget.Button;

public class MainActivity extends AppCompatActivity {

    //回调方法 （on开头的方法都是）
    //在创建时自动调用
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        //调用父类的回调方法
        super.onCreate(savedInstanceState);
        //设置内容视图文件
        //建立Activity和Layout文件之间的关联
        setContentView(R.layout.test_linearlayout);
        //1.获得这个组件
        Button bt2 =  (Button)findViewById(R.id.button2);
        //2.操作这个组件
       // bt2.setText("新按钮");
        //日志输出
        System.out.print("日志输出=应用开始运行");
        Log.v("HANQI", "Verbose级别的日志信息");
        Log.d("HANQI", "Debug级别的日志信息");
        Log.i("HANQI", "Info级别的日志信息");
        Log.w("HANQI", "Warning级别的日志信息");
        Log.e("HANQI", "Error级别的日志信息");
    }
    public void login_onClick(View v)
    {
        //打开新的Activity
        //1.创建意图  显式意图
        Intent intent = new Intent();
        //定义显式意图
        ComponentName componentName = new ComponentName(this,TextActivity.class);
        intent.setComponent(componentName);
        intent.putExtra("name", "意图传递的值");
        intent.putExtra("name1", "意图传递的值1");

        //2.发起意图
      startActivity(intent);
    }
    public void bt2_onClick(View v)
    {
        //发起隐式意图
        //打开拨打电话的界面
        //系统已经预先定义了常用功能的Action的字符串常量
        Intent intent2 = new Intent(Intent.ACTION_DIAL);
        //intent2.setAction(Intent.ACTION_DIAL);

        //构造Uri
        Uri uri = Uri.parse("tel:110");

        //intent2.addCategory("");

        //设置data
        intent2.setData(uri);

        //intent2.setType("");
        //intent2.setDataAndType(uri,"");
        startActivity(intent2);
    }

    public void bt3_onClick(View v)
    {
        //返回桌面
        Intent intent3 = new Intent(Intent.ACTION_MAIN);
        intent3.addCategory(Intent.CATEGORY_HOME);
        startActivity(intent3);
    }
}

package com.hanqi.myapplication;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;

//1.继承Activity
/**
 * Created by lenovo on 2016/4/22.
 */
public class TextActivity extends Activity {

    //成员变量
    EditText et1;
    EditText et2;
    EditText et3;
    //2.重写onCreate(),关联Layout文件
    //onCreate()是一个回调方法：在满足特定条件下自动调用的方法；方法名一般on开头

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        //关联
        setContentView(R.layout.message_relativelayout);
        //初始化工作
        //获取Layout文件中定义的组件

        et1=(EditText)findViewById(R.id.et1);
        et2=(EditText)findViewById(R.id.et2);
        et3=(EditText)findViewById(R.id.et3);
        Log.e("TAG","onCreat()被调用");

        //得到意图
        Intent intent = getIntent();
        String strname = intent.getStringExtra("name");
        String strname1 = intent.getStringExtra("name1");
        //intent.getExtras();
        Log.e("TAG","意图传递的数据="+strname);
        Log.e("TAG","意图传递的数据1="+strname1);
//        if(savedInstanceState!=null&&!savedInstanceState.isEmpty())
//        {
//        et1.setText(savedInstanceState.getString("et1")+"恢复之后的");
//        et2.setText(savedInstanceState.getString("et2"));
//        et3.setText(savedInstanceState.getString("et3"));
//        }
    }

    //保存状态
    @Override
    protected void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        Log.e("TAG", "保存应用状态");

        outState.putString("et1", et1.getText().toString());
        outState.putString("et1",et2.getText().toString());
        outState.putString("et1",et3.getText().toString());
    }

    //恢复状态
    @Override
    protected void onRestoreInstanceState(Bundle savedInstanceState) {
        super.onRestoreInstanceState(savedInstanceState);
        Log.e("TAG", "恢复应用状态");

        et1.setText(savedInstanceState.getString("et1")+"恢复之后的");
        et2.setText(savedInstanceState.getString("et2"));
        et3.setText(savedInstanceState.getString("et3"));

    }

    //启动
    @Override
    protected void onStart() {
        super.onStart();
        Log.e("TAG","onStart()被调用");
    }
    //重启
    @Override
    protected void onRestart() {
        super.onRestart();
        Log.e("TAG", "onRestart()被调用");
    }
    //继续
    @Override
    protected void onResume() {
        super.onResume();
        Log.e("TAG", "onResume()被调用");
    }
    //暂停
    @Override
    protected void onPause() {
        super.onPause();
        Log.e("TAG", "onPause()被调用");
    }
    //停止
    @Override
    protected void onStop() {
        super.onStop();
        Log.e("TAG", "onStop()被调用");
    }
    //销毁
    @Override
    protected void onDestroy() {
        super.onDestroy();
        Log.e("TAG", "onDestroy()被调用");
    }
    //点击事件方法
    public void bt_OnClick(View v)
    {
        //显示提示信息
        //方法链
        Toast.makeText(TextActivity.this, "消息发送成功", Toast.LENGTH_SHORT).show();
    }
    public void close_OnClick(View v)
    {
        //关闭应用
        finish();
    }
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="10dp">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="用户名："/>
    <EditText
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:hint="请输入用户名"/>
        </LinearLayout>
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="密码："/>
    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="请输入密码"
        android:inputType="textPassword"
        android:maxLength="6"/>
        </LinearLayout>

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content">
    <Button
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:text="显式意图"
        android:id="@+id/button"
        android:layout_weight="1"
        android:onClick="login_onClick"/>

    <Button
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:text="隐式意图"
        android:id="@+id/button3"
        android:layout_weight="1"
        android:onClick="bt2_onClick"/>
    <Button
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:text="返回桌面"
        android:id="@+id/button4"
        android:layout_weight="1"
        android:onClick="bt3_onClick"/>

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="New Button"
        android:id="@+id/button2"
        android:layout_gravity="center"
        android:textSize="20sp"
        android:textColor="@color/colorPrimary"
        android:background="@drawable/anniu05"
        android:visibility="gone"/>
</LinearLayout>
</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.hanqi.myapplication">

    <uses-permission android:name="android.permission.CALL_PHONE"></uses-permission>

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">

        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity android:name=".TextActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

    </application>

</manifest>