Intent练习

package com.hanqi.textapp1;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    String code;
    String name;
    String pass;
    EditText denglu;
    EditText mima;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }
    //View 代表事件的发起者

       // 注册
    public void bt1_onclick(View v){
        //带返回的打开注册的 Activity
        //返回注册信息

        //1.准备带返回的意图
        Intent intent=new Intent(this,zhuceActivity.class);

        startActivityForResult(intent, 1);

    }

    //处理返回信息
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        //处理返回信息
        //判断请求码
        if(requestCode==1){
            //判断结果码
            if(resultCode==RESULT_OK){
                //接受返回的信息
              code= data.getStringExtra("usercode");
                 name= data.getStringExtra("username");
                 pass= data.getStringExtra("password");



            }
            if(requestCode==RESULT_CANCELED){

            }
        }
    }

    //登陆
    public void bt2_onclick(View v){
        //判断


        //1取得填写信息
        denglu=(EditText)findViewById(R.id.et_usercode);
       mima =(EditText)findViewById(R.id.et_password);
        String dl=denglu.getText().toString();
        String mm=mima.getText().toString();

        //2 是否正确填写
        if(dl.trim().length()==0||mm.trim().length()==0){
            Toast.makeText(MainActivity.this, "用户代码或密码为空", Toast.LENGTH_LONG).show();
       return;
        }

        //3判断有无注册信息
        //1)没找到注册信息
        //2)填写的用户信息未注册
        if(code==null||!code.equals(dl)){
            Toast.makeText(MainActivity.this, "用户尚未注册", Toast.LENGTH_SHORT).show();
            return;
        }

        //4判断注册信息是否匹配
        if(!pass.equals(mm)){
            Toast.makeText(MainActivity.this, "密码错误", Toast.LENGTH_SHORT).show();

        }
        else{
            Toast.makeText(MainActivity.this, "用户验证成功", Toast.LENGTH_SHORT).show();

            Intent intent=new Intent(this,textActivity.class);
            intent.putExtra("nicheng",name);
            startActivity(intent);
            finish();
        }

    }


}

package com.hanqi.textapp1;

import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;

public class zhuceActivity extends AppCompatActivity {

    EditText et_usercode1;
    EditText et_password1;
    EditText et_username1;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_zhuce);

        et_usercode1=(EditText)findViewById(R.id.et_usercode1);
        et_password1=(EditText)findViewById(R.id.et_password1);
        et_username1=(EditText)findViewById(R.id.et_username);
    }
    public void bt2_onclick(View v){
        //返回注册信息

        //用户代码取得
        String usercoud=et_usercode1.getText().toString();

        if(usercoud==null||usercoud.trim().length()==0){

            Toast.makeText(zhuceActivity.this, "请正确填写用户代码", Toast.LENGTH_SHORT).show();
            return;
        }

        String username=et_username1.getText().toString();

        if(usercoud==null||usercoud.trim().length()==0){

            Toast.makeText(zhuceActivity.this, "请正确填写用户名称", Toast.LENGTH_SHORT).show();
           return;
        }

        String password=et_password1.getText().toString();

        if(usercoud==null||usercoud.trim().length()==0){

            Toast.makeText(zhuceActivity.this, "请正确填写用户密码", Toast.LENGTH_SHORT).show();
            return;

        }

        Intent intent=new Intent();

        intent.putExtra("usercode",usercoud);
        intent.putExtra("username",username);
        intent.putExtra("password",password);
        //设置返回信息，1 结果码 2 携带数据的intent
        setResult(RESULT_OK,intent);


        finish();
    }
    public void bt1_onclick(){
        setResult(RESULT_CANCELED,null);
        finish();
    }
}

package com.hanqi.textapp1;

import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

public class textActivity extends Activity {
   EditText dh;
    TextView nc;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.textactivity);
        dh=(EditText)findViewById(R.id.dianhua);
        Intent intent=getIntent();
        String str =intent.getStringExtra("nicheng").toString();
        nc=(TextView)findViewById(R.id.wenben);
        nc.setText(str);

    }





    //检查和获取电话号码的方法
    public String getphone(){
        String phone=dh.getText().toString().trim();
        //验证
        if(phone.length()==0){
            Toast.makeText(textActivity.this, "正确输入号码", Toast.LENGTH_SHORT).show();
            return null;

        }
        else {
            return phone;
        }

    }

    public void dadianhua(View v){
        //得到电话号码
        String phone=getphone();
        if(phone==null){
            return;
        }

        //调用打电话界面,隐式意图
        Intent intent=new Intent(Intent.ACTION_DIAL);//调用打电话的界面

        //传送电话号码  tel:number

        Uri uri=Uri.parse("tel:"+phone);
        intent.setData(uri);

        startActivity(intent);
    }

    public void dadianhua2(View v){

        String phone=getphone();
        if(phone==null){
            return;
        }
        //调用直接拨打需要授权
        Intent intent=new Intent(Intent.ACTION_CALL);//调用打电话的界面

        //传送电话号码  tel:number

        Uri uri=Uri.parse("tel:"+phone);
        intent.setData(uri);
        //处理异常
        try {
            startActivity(intent);
        }
        catch (Exception e){
            e.printStackTrace();//打印异常
        }


    }


}