在android中恢复音乐

Question

按主页按钮然后从最近列表中按应用程序后，音乐无法恢复。请对给出的代码进行必要的更改。

public class MainActivity extends AppCompatActivity {
    @Override
    protected void onPause() {
        super.onPause();
        mySound.release();
    }

    @Override
    protected void onResume() {
        super.onResume();
        if(mySound != null)
            mySound.start();
    }

    MediaPlayer mySound;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mySound = MediaPlayer.create(MainActivity.this,R.raw.sleep);
        mySound.start();
        mySound.setLooping(true);
    }
}

Answer 1

首先看一下How to ask a Good Question on SO。

其次请仔细阅读How to Add code in SO。

现在回答你的问题。问题出在Activity的{​​{1}}方法中，只需将其更改为。

onPause()

只有在@Override protected void onPause() { super.onPause(); if (mySound != null) mySound.pause(); } 不再需要时才调用release（）。来自Android docs

  

void release（）

     

释放与此MediaPlayer对象关联的资源。它是   当你完成使用时，我们认为这是一种很好的做法   MediaPlayer。

所以改为使用MediaPlayer

  

void pause（）

     

暂停播放。调用start（）恢复。

查看pause()的状态图

图表代表的是有效的状态，确定使用MediaPlayer对象。

Answer 2

$ aws rds describe-db-parameters --db-parameter-group-name default.mysql5.6 --query 'Parameters[*].ParameterName'
[
    "allow-suspicious-udfs",
    "auto_increment_increment",
    "auto_increment_offset",
    "autocommit",
    "automatic_sp_privileges",
    "back_log",
    "basedir",
    "binlog_cache_size",
    "binlog_checksum",
    "binlog_error_action",
    "binlog_format",
    "binlog_max_flush_queue_time",
    "binlog_order_commits",
    "binlog_row_image",
    "binlog_rows_query_log_events",
    "binlog_stmt_cache_size",
    "binlogging_impossible_mode",
    "bulk_insert_buffer_size",
    "character-set-client-handshake",
    "character_set_client",
    "character_set_connection",
    "character_set_database",
    "character_set_filesystem",
    "character_set_results",
    "character_set_server",
    "collation_connection",
    "collation_server",
    "completion_type",
    "concurrent_insert",
    "connect_timeout",
    "core-file",
    "datadir",
    "default_storage_engine",
    "default_time_zone",
    "default_tmp_storage_engine",
    "default_week_format",
    "delay_key_write",
    "delayed_insert_limit",
    "delayed_insert_timeout",
    "delayed_queue_size",
    "div_precision_increment",
    "end_markers_in_json",
    "enforce_gtid_consistency",
    "eq_range_index_dive_limit",
    "event_scheduler",
    "explicit_defaults_for_timestamp",
    "flush",
    "flush_time",
    "ft_boolean_syntax",
    "ft_max_word_len",
    "ft_min_word_len",
    "ft_query_expansion_limit",
    "ft_stopword_file",
    "general_log",
    "general_log_file",
    "group_concat_max_len",
    "gtid-mode",
    "host_cache_size",
    "init_connect",
    "innodb_adaptive_flushing",
    "innodb_adaptive_flushing_lwm",
    "innodb_adaptive_hash_index",
    "innodb_adaptive_max_sleep_delay",
    "innodb_autoextend_increment",
    "innodb_autoinc_lock_mode",
    "innodb_buffer_pool_dump_at_shutdown",
    "innodb_buffer_pool_dump_now",
    "innodb_buffer_pool_filename",
    "innodb_buffer_pool_instances",
    "innodb_buffer_pool_load_abort",
    "innodb_buffer_pool_load_at_startup",
    "innodb_buffer_pool_load_now",
    "innodb_buffer_pool_size",
    "innodb_change_buffer_max_size",
    "innodb_change_buffering",
    "innodb_checksum_algorithm",
    "innodb_cmp_per_index_enabled",
    "innodb_commit_concurrency",
    "innodb_compression_failure_threshold_pct",
    "innodb_compression_level",
    "innodb_compression_pad_pct_max",
    "innodb_concurrency_tickets",
    "innodb_data_home_dir",
    "innodb_fast_shutdown",
    "innodb_file_format",
    "innodb_file_per_table",
    "innodb_flush_log_at_timeout",
    "innodb_flush_log_at_trx_commit",
    "innodb_flush_method",
    "innodb_flush_neighbors",
    "innodb_flushing_avg_loops",
    "innodb_force_load_corrupted",
    "innodb_ft_aux_table",
    "innodb_ft_cache_size",
    "innodb_ft_enable_stopword",
    "innodb_ft_max_token_size",
    "innodb_ft_min_token_size",
    "innodb_ft_num_word_optimize",
    "innodb_ft_result_cache_limit",
    "innodb_ft_server_stopword_table",
    "innodb_ft_sort_pll_degree",
    "innodb_ft_user_stopword_table",
    "innodb_io_capacity",
    "innodb_io_capacity_max",
    "innodb_large_prefix",
    "innodb_lock_wait_timeout",
    "innodb_log_buffer_size",
    "innodb_log_compressed_pages",
    "innodb_log_file_size",
    "innodb_log_group_home_dir",
    "innodb_lru_scan_depth",
    "innodb_max_dirty_pages_pct",
    "innodb_max_purge_lag",
    "innodb_max_purge_lag_delay",
    "innodb_monitor_disable",
    "innodb_monitor_enable",
    "innodb_monitor_reset",
    "innodb_monitor_reset_all",
    "innodb_old_blocks_pct",
    "innodb_old_blocks_time",
    "innodb_online_alter_log_max_size",
    "innodb_open_files",
    "innodb_optimize_fulltext_only",
    "innodb_page_size",
    "innodb_print_all_deadlocks",
    "innodb_purge_batch_size",
    "innodb_purge_threads",
    "innodb_random_read_ahead",
    "innodb_read_ahead_threshold",
    "innodb_read_io_threads",
    "innodb_read_only",
    "innodb_replication_delay",
    "innodb_rollback_on_timeout",
    "innodb_rollback_segments",
    "innodb_sort_buffer_size",
    "innodb_spin_wait_delay",
    "innodb_stats_auto_recalc",
    "innodb_stats_method",
    "innodb_stats_on_metadata",
    "innodb_stats_persistent",
    "innodb_stats_persistent_sample_pages",
    "innodb_stats_transient_sample_pages",
    "innodb_strict_mode",
    "innodb_support_xa",
    "innodb_sync_array_size",
    "innodb_sync_spin_loops",
    "innodb_table_locks",
    "innodb_thread_concurrency",
    "innodb_thread_sleep_delay",
    "innodb_undo_directory",
    "innodb_undo_logs",
    "innodb_undo_tablespaces",
    "innodb_use_native_aio",
    "innodb_write_io_threads",
    "interactive_timeout",
    "join_buffer_size",
    "keep_files_on_create",
    "key_buffer_size",
    "key_cache_age_threshold",
    "key_cache_block_size",
    "key_cache_division_limit",
    "lc_time_names",
    "local_infile",
    "lock_wait_timeout",
    "log-bin",
    "log_bin_trust_function_creators",
    "log_bin_use_v1_row_events",
    "log_error",
    "log_output",
    "log_queries_not_using_indexes",
    "log_slave_updates",
    "log_slow_admin_statements",
    "log_slow_slave_statements",
    "log_throttle_queries_not_using_indexes",
    "log_warnings",
    "long_query_time",
    "low_priority_updates",
    "lower_case_table_names",
    "master-info-repository",
    "master_verify_checksum",
    "max_allowed_packet",
    "max_binlog_cache_size",
    "max_binlog_size",
    "max_binlog_stmt_cache_size",
    "max_connect_errors",
    "max_connections",
    "max_delayed_threads",
    "max_error_count",
    "max_heap_table_size",
    "max_insert_delayed_threads",
    "max_join_size",
    "max_length_for_sort_data",
    "max_prepared_stmt_count",
    "max_seeks_for_key",
    "max_sort_length",
    "max_sp_recursion_depth",
    "max_tmp_tables",
    "max_user_connections",
    "max_write_lock_count",
    "metadata_locks_cache_size",
    "min_examined_row_limit",
    "myisam_data_pointer_size",
    "myisam_max_sort_file_size",
    "myisam_mmap_size",
    "myisam_sort_buffer_size",
    "myisam_stats_method",
    "myisam_use_mmap",
    "net_buffer_length",
    "net_read_timeout",
    "net_retry_count",
    "net_write_timeout",
    "old-style-user-limits",
    "old_passwords",
    "optimizer_prune_level",
    "optimizer_search_depth",
    "optimizer_switch",
    "optimizer_trace",
    "optimizer_trace_features",
    "optimizer_trace_limit",
    "optimizer_trace_max_mem_size",
    "optimizer_trace_offset",
    "performance_schema",
    "performance_schema_accounts_size",
    "performance_schema_digests_size",
    "performance_schema_events_stages_history_long_size",
    "performance_schema_events_stages_history_size",
    "performance_schema_events_statements_history_long_size",
    "performance_schema_events_statements_history_size",
    "performance_schema_events_waits_history_long_size",
    "performance_schema_events_waits_history_size",
    "performance_schema_hosts_size",
    "performance_schema_max_cond_classes",
    "performance_schema_max_cond_instances",
    "performance_schema_max_file_classes",
    "performance_schema_max_file_handles",
    "performance_schema_max_file_instances",
    "performance_schema_max_mutex_classes",
    "performance_schema_max_mutex_instances",
    "performance_schema_max_rwlock_classes",
    "performance_schema_max_rwlock_instances",
    "performance_schema_max_socket_classes",
    "performance_schema_max_socket_instances",
    "performance_schema_max_stage_classes",
    "performance_schema_max_statement_classes",
    "performance_schema_max_table_handles",
    "performance_schema_max_table_instances",
    "performance_schema_max_thread_classes",
    "performance_schema_max_thread_instances",
    "performance_schema_session_connect_attrs_size",
    "performance_schema_setup_actors_size",
    "performance_schema_setup_objects_size",
    "performance_schema_users_size",
    "pid_file",
    "plugin_dir",
    "port",
    "preload_buffer_size",
    "profiling_history_size",
    "query_alloc_block_size",
    "query_cache_limit",
    "query_cache_min_res_unit",
    "query_cache_size",
    "query_cache_type",
    "query_cache_wlock_invalidate",
    "query_prealloc_size",
    "range_alloc_block_size",
    "read_buffer_size",
    "read_only",
    "read_rnd_buffer_size",
    "relay-log",
    "relay_log_info_repository",
    "relay_log_recovery",
    "safe-user-create",
    "secure_auth",
    "secure_file_priv",
    "server_id",
    "simplified_binlog_gtid_recovery",
    "skip-character-set-client-handshake",
    "skip-slave-start",
    "skip_external_locking",
    "skip_name_resolve",
    "skip_show_database",
    "slave_checkpoint_group",
    "slave_checkpoint_period",
    "slave_parallel_workers",
    "slave_pending_jobs_size_max",
    "slave_sql_verify_checksum",
    "slave_type_conversions",
    "slow_launch_time",
    "slow_query_log",
    "slow_query_log_file",
    "socket",
    "sort_buffer_size",
    "sql_mode",
    "sql_select_limit",
    "stored_program_cache",
    "sync_binlog",
    "sync_frm",
    "sync_master_info",
    "sync_relay_log",
    "sync_relay_log_info",
    "sysdate-is-now",
    "table_definition_cache",
    "table_open_cache",
    "table_open_cache_instances",
    "temp-pool",
    "thread_cache_size",
    "thread_stack",
    "time_zone",
    "timed_mutexes",
    "tmp_table_size",
    "tmpdir",
    "transaction_alloc_block_size",
    "transaction_prealloc_size",
    "tx_isolation",
    "updatable_views_with_limit",
    "validate-password",
    "validate_password_dictionary_file",
    "validate_password_length",
    "validate_password_mixed_case_count",
    "validate_password_number_count",
    "validate_password_policy",
    "validate_password_special_char_count",
    "wait_timeout"
]