《Android开发》——1.Activity之间的参数传递

最新推荐文章于 2024-04-07 22:00:43 发布

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本文介绍了在Android应用程序中如何在不同Activity之间通过Intent和Bundle进行参数传递的方法。具体包括使用Intent.putExtra和Intent.putExtras的方式，并展示了如何在目标Activity中解析这些参数。

Activity 之间的参数传递

在两个Activity之间，可以通过Intent进行参数传递，同时，Intent可以结合包数据Bundle进行打包传输。

Intent

MainActivity.java

@Override
protected void onCreate(Bundle savedInstanceState){
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    findViewById(R.id.btnStart).setOnClickListener(new View.OnClickListener(){
        @Override
        public void onClick(View v){
            Intent intent=new Intent(MainActivity.this,AnotherActivity.class);
            intent.putExtra("parameter","start new activity");
            startActivity(intent);
        }
    });
}

AnotherActivity.java

@Override
protected void onCreate(Bundle savedInstanceState){
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_another);

    textView=(TextView)findViewById(R.id.textView);
    Intent intent=getIntent();
    textView.setText(intent.getStringExtra("parameter"));
}

Bundle

1、使用Intent.putExtras与Bundle

MainActivity.java

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        findViewById(R.id.btnStart).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(MainActivity.this,AnotherActivity.class);
//              intent.putExtra("parameter","start new activity");
                Bundle bundle = new Bundle();
                bundle.putString("parameter","get bundle data");
                bundle.putInt("age",56);
                bundle.putString("name1","wgt");
                intent.putExtras(bundle);
                startActivity(intent);
            }
        });
    }

AnotherActivity.java

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_another);

    textView = (TextView) findViewById(R.id.textView);
    Intent intent = getIntent();
    Bundle bundle = intent.getExtras();
    textView.setText(String.format("parameter=%s,age=%d,name1=%s",bundle.getString("parameter"),
    bundle.getInt("age"),bundle.getString("name1","leo")));
}

2、使用Intent.putExtra与Bundle

MainActivity.java

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    findViewById(R.id.btnStart).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(MainActivity.this,AnotherActivity.class);
//              intent.putExtra("parameter","start new activity");
                Bundle bundle = new Bundle();
                bundle.putString("parameter","get bundle data");
                bundle.putInt("age",56);
                bundle.putString("name1","wgt");
//              intent.putExtras(bundle);
                intent.putExtra("bundle",bundle);
                startActivity(intent);
            }
      });
}

AnotherActivity.java

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_another);

    textView = (TextView) findViewById(R.id.textView);
    Intent intent = getIntent();
//  Bundle bundle = intent.getExtras();
    Bundle bundle = intent.getBundleExtra("bundle");
    textView.setText(String.format("parameter=%s,age=%d,name1=%s", bundle.getString("parameter"),
    bundle.getInt("age"), bundle.getString("name1", "leo")));
}